Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Switch: CHCGILSUDS2

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-202 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-204 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-227 A Chicago Zone 01-Calumet IL 9329 AMERITECH ILLINOIS 358   2010-10-15   
312-255 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-266 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-274 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-280 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-302 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-306 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-337 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-397 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-445 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-469 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-475 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-482 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-573 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-640 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-642 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-649 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-664 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-694 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-695 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-703 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-712 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-787 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-799 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-908 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-915 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-921 A Chicago Zone 01-Calumet IL 9329 AMERITECH ILLINOIS 358   2008-09-01   
312-926 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-943 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-944 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-951 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-988 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      

Last updated: Sun, 10 Nov 2019 13:49:34 UTC

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